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Prev Professional Automotive Repair Technical Discussions for November 25, 2009
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Open Help Requests for GM
Help Request Answers
1989 Buick LeSabre 3.8L Seat Belts VIN: 1G4CW54C7K
Seat belt light will come on itermittently. When it does it jambs the door latches and they cannot be opened. Alldata does not contain a description of this system and I could not see the realation until I took the driver panel off and found the cable from the...
1996 Buick Riviera 3.8L air bag system VIN: 1G4GD2218T
I'll try to make a long story short, This vehicle came in with ABS, TRAC and AIR BAG light on and also PRNDL switch flashing on dash, also some of the gauges were going goofy. Originally could not access abs module. Intermittenly could access module and was ab...
2000 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP54K0Y
this car came in running for a programming of a new remote for the remote starter. (rattler system) the orig system was a "circuit city special" and very sloppy-no valet switch and no hood switch was installed. we hooked up a valet button (blue connector) swit...
2005 Buick Rendezvous CX 3.4L Heater VIN: 3G5DB03E85
I am hoping that someone might have some info on what I need to do or look for on this ugly car. When the vehichl arrived at my shop the temp gauge read very high and flucuating back to very cool. the heater was blowing very cool when set at the warmest possib...
1991 Chevrolet Camaro Z28 5.7L Poor Idle Quality, Hesitation, Surge, Stall VIN: 1G1FP2380M
well guy, i got everyone elses problem. this car came to me with a surge at idle, and a hesitaion at cruizing speed. it seems everyone else has had a go at this car, apperently throwing parts at it. (new iac, map, tps, computer, o2 sensor, plugs, wires, we did... Trouble codes: 33 (map), 34 (map)
1993 Chevrolet C3500 Cheyenne 5.7L Hesitation, Stall VIN: 3GCJC44K9P
hi all! please help me w/ this one this truck is fine when colt but after 10 min, cuts out and sturb for fuel the only way runs if i dead head fuel pump i get 28 psi and truck runs good by the way the o2 sensor wires r gone i dont know if somebody took em out ... Trouble codes: 13 (02 sensor), 34 (map sensor)
1996 Chevrolet Blazer LS 4.3L Windshield Washer VIN: 1GNDT13W7T
Hello fellow techs, allow me to thank you in advance for any assistance you can give. This vehicle came in on 11/12 complaining of the windshield washers not working. We performed the diagnostics and determined that the Multifunction switch was the problem. We...
1998 Chevrolet C3500 Silverado 6.5L fuel gauge VIN: 1GBKC34F8W
Hey folks, I've got one here that is causing me to pull my hair out. This truck has a minor problem where the fuel gauge will basically vibrate really fast. It isn't moving around much just vibrating. I've seen a few of these over the years doing this but no o...
2001 Chevrolet Express 3500 5.7L abs VIN: 1GCHG35R01
I've been working on this one on and off for about 3 weeks now and I just can't take it anymore. I get a ton of codes from Tech 2 but none show up on GM's website. I've replace EBCM and BPMV thinking it's a GM it probably fried the EBCM. No change and all the ...
2002 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS195X2
Vehicle has PO420 Cat Efficency code, checked exhaust readings, all good, Oxygens sensors good, front new. Showing that light is setting at idle, all our info shows should not set untill over [...], New aftermarket converter was installed 6months ago with n... Trouble codes: P0420
2002 Chevrolet Trailblazer LS 4.2L front suspension\ VIN: 1GNET16S02
The squeek only occurs when traveling at speeds under 5MPH and applying brakes firmly. The stabilizer bar bushings have been lubricated with spray lube. Noise still there. The stabilizer bar links are tight and dont move when prying on the bar. Noise is not pr...
2004 Chevrolet Venture LS 3.4L cooling fan VIN: 1GBDX23EX4
hi every one, this van came in with overheating trouble, we found cooling fans will not come on unless it is on defrost mode or a/c then van will not over heat, but if heater is off or on heat only fans will not work, we checked all three cooling relays, they ...
2006 Chevrolet HHR LT 2.4L Headlights VIN: 3GNDA23P56
Hello everyone, thanks in advance for your help! This customer says that intermittently the headlights will stay on after the car is shut off. The customer says the only way to get them to go off is to disconnect the battery. I have not been able to recreate t...
2009 Chevrolet Cobalt LT 2.2L turnig VIN: 1G1AT18H49
Customer hears clicking or popping noise at low speeds(5-20 mph)when turning/ with or without brake applied. Any Chevy people know whats going on with these electric steer models? Or is this suspension related? Noise doesn't sound like it's coming from midshaf...
1995 Pontiac Firebird Trans Am 5.7L Poor Idle Quality, Misfire VIN: 2G2FV22PXS
please help this 5.7 p engine has a strange miss and noid light wont work unless engine is off and then light connected or if injector plug is removed you either need to wait for 20 to 30 seconds or shut off ignition and restart,(basically if you unplug the in...
2006 Pontiac Vibe 1.8L trans inop VIN: 5Y2SL65896
Common issue with Vibes, Matrix, and Corolla lines, P06** internal failure of the PCM. replaced the pcm with a used unit. CEL is off, Engine runs fine. Transmission starts in high gear unless manually started in L. then manually moved to 2nd, shifts to 4th and... Trouble codes: P0607 (PCM failure)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille 4.6L speedometer VIN: 1G6KD52Y7V
I replaced speedmeter head and that fixed it. even after I had it tested by speedometer shop that said it was ok,I sent the car to them and still said it was ok. I tested with scope at input an had wave sign.
1996 Chevrolet C1500 Suburban 5.7L Unknown VIN: R3TG156548
2000 Chevrolet Impala LS 3.8L Hesitation, MIL Lamp on VIN: 2G1WH55K8Y
Thank you to all how took the time to respond to my help request.Thank you to Michael,Joe,Austin,Daniel,Robert there post say replace mass airflow sensor with new one and that was the fix.Put new one in and scan tool data shows data coming for sensor and no ch... Trouble codes: P0102.
2004 Chevrolet Trailblazer EXT LS 4.2L MIL Lamp on VIN: S042182277
2004 Chevrolet Colorado Sport 3.5L No Start, Stall VIN: 1GCCS19684
Installed new PCM and had flashed, checked all grounds, test drove good. Thanks for all the good responses David. Trouble codes: C0899, V1064 (Communication Loss with BCM), P0601, P0601.
2005 Chevrolet Silverado 1500 5.3L temp controls VIN: 2GCEK13T95
Long story short, it was the door position wire had a bad connection at the instrument panel junction block.. long story: replaced the HVAC module, which is also the head unit. It is programmable and I programed it. The temp or mode doors still didn't work. we...
2006 Chevrolet Uplander LS 3.5L headlights VIN: 1GNDV23126
well, thanks to everybody who informed me of the tsb and part# for updated regulator. Shame on mitchell for not listing the tsb, and shame on the local gm dealer who didn't know about the tsb. I installed the new regulator and charging system voltage stays ste...
1999 GMC Sierra 1500 SLE 4.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GTEC14W9X
thanks for all the help and was able to fix this vehicl.there was alot of things that needed to be done, cleaned mass air flow and all codes went away, except for the po 300 recuring daily base engine was fine. comression good , plug . wires, but cap was bad ... Trouble codes: P0131, P0137, P00, 151 (low volts b2s1), P0157, P00, 300 (mulyiple cyl miss detected), P1351.
2004 GMC Yukon XL 1500 Denali 6.0L poping noise VIN: 1GKFK66U24
Well, thank you to everyone who helped, unfortunately did not fix this one. justin had an interesting thought about the purge valve. I tried it even disabled it, noise still there. retorque all bolts to suspension, frame, crossmember (no luck mike, thanks t...
1999 Saturn SL2 1.9L Poor Idle Quality, Cuts out VIN: 1G8ZK5279X
This vehicle was fixed by replacing the coolant temp sensor and harness connector, even though scanner would give only proper temperature when problem was there (which still causes me to wonder why), corroded harness and sensor inside was deteriorating as so m... Trouble codes: P0341, P1620, P0340, P0731, P1599.
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